“ These bugs swarm about electric street lights in such numbers as to be known in many places, of late, as ‘electric-light bugs.’ They breed and develop wholly in the water, but their life history is not well known. The females of a related genus, Zaitha, have been found to have the curious habit of depositing and fastening their eggs upon the backs of the males, who unwillingly carry them about until they hatch. Great damage may follow the introduction of these bugs into fish-cultural establishments. ”